CN114651414B

CN114651414B - Extended demodulation reference signal scrambling identifier for demodulation reference signal communication

Info

Publication number: CN114651414B
Application number: CN202080077555.XA
Authority: CN
Inventors: 雷静; 陈万士; P.加尔
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2019-11-15
Filing date: 2020-11-12
Publication date: 2024-04-16
Anticipated expiration: 2040-11-12
Also published as: KR20220099952A; JP2023501249A; BR112022008615A2; CN114651414A; US20230370224A1; WO2021097485A1; TW202126012A; EP4059176A1; US11743004B2; US20210152304A1

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a User Equipment (UE) may receive information from a Base Station (BS) identifying an amount of demodulation reference signal (DMRS) sequences supported by each antenna panel of the BS. The UE may transmit the DMRS communication with one or more DMRS sequences configured based at least in part on an amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble. Numerous other aspects are provided.

Description

Extended demodulation reference signal scrambling identifier for demodulation reference signal communication

Cross Reference to Related Applications

This patent application claims priority from U.S. provisional patent application No. 62/936,243 entitled "EXTENDED DEMODULATION REFERENCE SIGNAL SCRAMBLING IDENTIFIER FOR DEMODULATION REFERENCE SIGNAL communicator" filed on 11/15/2019 and U.S. non-provisional patent application No. 16/949,716 entitled "EXTENDED DEMODULATION REFERENCE SIGNAL SCRAMBLING IDENTIFIER FORDEMODULATION REFERENCE SIGNAL communicator" filed on 11/2020, which are expressly incorporated herein by reference.

Technical Field

Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for extended demodulation reference signal (DMRS) scrambling identifiers for DMRS communications in uplink unlicensed transmissions.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced (LTE-Advanced) is an enhanced set of Universal Mobile Telecommunications System (UMTS) mobile standards promulgated by the third generation partnership project (3 GPP).

The wireless communication network may include a plurality of Base Stations (BSs) that may support communication for a plurality of User Equipments (UEs). A User Equipment (UE) may communicate with a Base Station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a node B, gNB, an Access Point (AP), a radio head, a Transmission and Reception Point (TRP), a New Radio (NR) BS, a 5G node B, and the like.

The multiple access technique described above has been adopted in various telecommunications standards to provide a generic protocol that enables different user devices to communicate at municipal, national, regional and even global levels. A New Radio (NR), which may also be referred to as 5G, is an enhanced set of LTE mobile standards promulgated by the third generation partnership project (3 GPP). NR is designed to better support mobile broadband internet access by: improved spectral efficiency, reduced cost, improved service, utilization of new spectrum, and better integration with other open standards using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the Downlink (DL) (CP-OFDM), CP-OFDM and/or SC-FDM on the Uplink (UL) (e.g., also known as discrete fourier transform spread OFDM (DFT-s-OFDM)), as well as support beamforming, multiple Input Multiple Output (MIMO) antenna techniques, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, further improvements in LTE and NR technologies are needed. Preferably, these improvements should be applicable to other multiple access techniques and telecommunication standards employing these techniques.

Disclosure of Invention

In some aspects, a wireless communication method performed by a User Equipment (UE) includes: receiving, from a Base Station (BS), information identifying an amount of demodulation reference signal (DMRS) sequences supported by each antenna panel of the BS; and transmitting DMRS communications with one or more DMRS sequences configured based at least in part on an amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

In some aspects, a UE for wireless communication includes a memory and one or more processors coupled with the memory, the memory and the one or more processors configured to: receiving, from a BS, information identifying an amount of DMRS sequences supported by each antenna panel of the BS; and transmitting DMRS communications with one or more DMRS sequences configured based at least in part on an amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the one or more processors to: receiving, from a BS, information identifying an amount of DMRS sequences supported by each antenna panel of the BS; and transmitting DMRS communications with one or more DMRS sequences configured based at least in part on an amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

In some aspects, an apparatus for wireless communication comprises: means for receiving, from a BS, information identifying an amount of DMRS sequences supported by each antenna panel of the BS; and means for transmitting DMRS communications with one or more DMRS sequences configured based at least in part on an amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer readable medium, user device, base station, wireless communication device, and/or processing system, as generally described herein with reference to and as illustrated by the accompanying drawings and description.

The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures to achieve the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The nature of the concepts disclosed herein, their organization and method of operation, and the associated advantages will be better understood from the following description when considered in connection with the accompanying drawings. Each of the figures is provided for the purpose of illustration and description, and is not intended as a definition of the limits of the claims.

Drawings

So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with aspects of the present disclosure.

Fig. 2 is a block diagram conceptually illustrating an example of a base station communicating with a UE in a wireless communication network, in accordance with aspects of the present disclosure.

Fig. 3 is a diagram illustrating an example of a channel structure for transmitting a Physical Random Access Channel (PRACH) message type a (msgA) in accordance with aspects of the present disclosure.

Fig. 4 is a diagram illustrating an example of a resource map for transmitting PRACH msgA in accordance with aspects of the present disclosure.

Fig. 5 is a diagram illustrating an example of a transmit chain for transmitting PRACH msgA in accordance with aspects of the present disclosure.

Fig. 6 is a diagram illustrating an example of using an extended DMRS scrambling identifier for DMRS communication in accordance with aspects of the present disclosure.

Fig. 7 is a diagram illustrating example processing performed, for example, by a user device, in accordance with aspects of the present disclosure.

Detailed Description

Aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method of practice may be practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover an apparatus or method that is practiced using other structures, functions, or structures and functions in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

Several aspects of a telecommunications system will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

It should be noted that while aspects may be described herein using terms commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure may be applied to other generation-based communication systems, such as 5G and later versions, including NR technologies.

Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. Wireless network 100 may include a plurality of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110 d) and other network entities. A BS is an entity that communicates with User Equipment (UE) and may also be referred to as a base station, NR BS, node B, gNB, 5G Node B (NB), access point, transmission Reception Point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to a coverage area of a BS and/or a BS subsystem serving such coverage area, depending on the context in which the term is used.

The BS may provide communication coverage for a macrocell, a picocell, a femtocell, and/or another type of cell. A macrocell can cover a relatively large geographic area (e.g., a few kilometers in radius) and can allow unrestricted access by UEs with service subscription. The pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow limited access to UEs associated with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)). The BS for the macro cell may be referred to as a macro BS. The BS for the pico cell may be referred to as a pico BS. The BS for the femto cell may be referred to as a femto BS or a home BS. In the example shown in fig. 1, BS110 a may be a macro BS for macro cell 102a, BS110 b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102 c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "node B", "5G NB" and "cell" may be used interchangeably herein.

In some aspects, a cell may not necessarily be fixed, and the geographic area of the cell may move according to the positioning of the mobile BS. In some aspects, BSs may be interconnected to each other and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transmitting network.

The wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., BS or UE) and transmit a transmission of data to a downstream station (e.g., UE or BS). The relay station may also be a UE that may relay transmissions for other UEs. In the example shown in fig. 1, relay station 110d may communicate with macro BS 110a and UE120d to facilitate communication between BS 110a and UE120 d. The relay station may also be referred to as a relay BS, a relay base station, a relay, etc.

The wireless network 100 may be a heterogeneous network including different types of BSs, such as macro BSs, pico BSs, femto BSs, relay BSs, and the like. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

The network controller 130 may be coupled to a set of BSs and may provide coordination and control for the BSs. The network controller 130 may communicate with the BS via a backhaul. BSs may also communicate with each other (directly or indirectly) via wireless or wired backhaul.

UEs 120 (e.g., 120a, 120b, 120 c) may be dispersed throughout wireless network 100, and each UE may be fixed or mobile. A UE may also be called an access terminal, mobile station, subscriber unit, station, etc. The UE may be a cellular telephone (e.g., a smart phone), a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a Wireless Local Loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, a super-book, a medical device or equipment, a biosensor/device, a wearable device (smart watch, smart garment, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., music or video device, or satellite radio), an in-vehicle component or sensor, smart meter/sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

Some UEs may be considered Machine Type Communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that may communicate with a base station, another device (e.g., a remote device), or some other entity. For example, the wireless node may provide connectivity to a network or to a network (e.g., a wide area network such as the internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered internet of things (IoT) devices and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered Customer Premise Equipment (CPE). UE 120 may be included within a housing that houses components of UE 120 (such as processor components, memory components, etc.).

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular Radio Access Technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, etc. Frequencies may also be referred to as carriers, frequency channels, etc. Each frequency may support a single RAT in a given geographical area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120 e) may communicate directly using one or more side-link channels (e.g., without using base station 110 as an intermediary to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, etc., a vehicle-to-pedestrian (V2P) protocol, etc.), a mesh network, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by base station 110.

As indicated above, fig. 1 is provided as an example. Other examples may differ from that described with respect to fig. 1.

Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in fig. 1. Base station 110 may be equipped with T antennas 234a through 234T, and UE 120 may be equipped with R antennas 252a through 252R, where typically T.gtoreq.1 and R.gtoreq.1.

At base station 110, transmit processor 220 may receive data for one or more UEs from data source 212, select one or more Modulation and Coding Schemes (MCSs) for each UE based at least in part on Channel Quality Indicators (CQIs) received from the UEs, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UEs, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-Static Resource Partition Information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRSs)) and synchronization signals (e.g., primary Synchronization Signals (PSS) and Secondary Synchronization Signals (SSS)). A Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T Modulators (MODs) 232a through 232T. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232T may be transmitted via T antennas 234a through 234T, respectively. According to aspects described in more detail below, a position-coding may be utilized to generate a synchronization signal to communicate additional information.

At UE 120, antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254R, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to controller/processor 280. The channel processor may determine a Reference Signal Received Power (RSRP), a Received Signal Strength Indicator (RSSI), a Reference Signal Received Quality (RSRQ), a Channel Quality Indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

On the uplink, at UE 120, transmit processor 264 may receive and process data from data source 262 as well as control information from controller/processor 280 (e.g., for reports containing RSRP, RSSI, RSRQ, CQI, etc.). Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station 110. At base station 110, uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 (if applicable), and further processed by a receive processor 238 to obtain decoded data and control information transmitted by UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to a controller/processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292.

The controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component of fig. 2 may perform one or more techniques related to DMRS communication using extended demodulation reference signal (DMRS) scrambling identifiers, as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component of fig. 2 may perform or direct operations such as process 700 of fig. 7 and/or other processes described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and/or memory 282 may include non-transitory computer-readable media storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and/or UE 120, may perform or direct operations such as process 700 of fig. 7 and/or other processes described herein. The scheduler 246 may schedule UEs on the downlink and/or uplink for data transmission.

In some aspects, UE 120 may include: means for receiving information from a base station (e.g., BS 110) identifying an amount of DMRS sequences supported by each antenna panel of the BS, or means for transmitting DMRS communications with one or more DMRS sequences configured based at least in part on the amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble, and so on. In some aspects, such components may include one or more components of UE 120 described in connection with fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

As indicated above, fig. 2 is provided as an example. Other examples may differ from that described with respect to fig. 2.

Fig. 3 is a diagram illustrating an example 300 of a channel structure for transmitting a Physical Random Access Channel (PRACH) message type a (msgA) in accordance with aspects of the present disclosure.

As shown in fig. 3, the channel structure for transmitting the PRACH msgA may include resources allocated for a preamble part (msgA preamble) and a payload part (msgA payload). The preamble, which may include a Cyclic Prefix (CP), is located for PRACH transmission (T _PRACH ) In the allocated time and frequency resources. After allocating time resources for PRACH transmission, the channel structure may include as a guard period and/or a gap period (T, respectively _G,1 And T _gap,2 ) Time and frequency resources are allocated to effect a transition of the transmit chain from msgA preamble transmission to msgA payload transmission. As shown, the msgA payload portion may include DMRS transmissions multiplexed with Physical Uplink Shared Channel (PUSCH) transmissions, as described in more detail herein. The msgA payload portion may include a guard period (T _G,2 ) To enable the UE to transition from transmitting PRACH msgA to transmitting another communication or receiving a communication.

As indicated above, fig. 3 is provided as an example. Other examples may differ from that described with respect to fig. 3.

Fig. 4 is a diagram illustrating an example 400 of a resource map for transmitting PRACH msgA in accordance with aspects of the present disclosure.

As shown in fig. 4, the msgA transmission occasion may include time and frequency resources mapped to a Synchronization Signal Block (SSB) in a set of SSBs. The msgA transmission opportunity may occur in an initial or active uplink bandwidth portion (BWP) and may include a Random Access Channel (RACH) slot with a set of RACH Opportunities (ROs). Further, the msgA transmission occasion may include one or more different types of PUSCH configurations, such as msgA PUSCH configuration #1 and msgA PUSCH configuration #2.

In some aspects, the BS may configure a first set of two different Transport Block Sizes (TBSs) for the msgA PUSCH in the system information when the UE is in a Radio Resource Control (RRC) idle state or an RRC inactive state. The first set of two different TBSs may be configured for transmission in the initial BWP. Conversely, when the UE is in RRC connected state, the BS may configure a second set of two different TBSs for the msgA PUSCH. In this case, the BS may configure a second set of TBSs for the active bandwidth portion (e.g., which may be the same or different from the initial bandwidth portion) in RRC signaling. Based at least in part on receiving information from the BS identifying a set of transport block sizes, the UE may select a particular TBS based at least in part on layer 1 Reference Signal Received Power (RSRP) measurements, contents of the msgA data buffer, satisfaction of the msgA group size parameter, and the like.

As indicated above, fig. 4 is provided as an example. Other examples may differ from that described with respect to fig. 4.

Fig. 5 is a diagram illustrating an example 500 of a transmit chain for transmitting PRACH msgA in accordance with aspects of the present disclosure.

As shown in fig. 5, a UE (such as UE 120) may include a transmit chain for transmitting msgA. In this case, the UE may receive a payload and a Cyclic Redundancy Check (CRC) at a transmit chain, and may perform channel coding and rate matching on the payload and the CRC to generate bits for transmission. After performing channel coding and rate matching, the UE may scramble the bits of the payload and CRC using a scrambling sequence. For example, the bit scrambling module may use a scrambling sequence of the form:

C _init ＝RA-RNTI×2 ¹⁶ +RAPID×2 ¹⁰ +n _ID ，

wherein C is _init Representing an initial value of a scrambling sequence, the RA-RNTI is a Random Access (RA) Radio Network Temporary Identifier (RNTI), and n _ID The representation is based at least in part on an initialization value of the UE identifier.

As further shown in fig. 5, based on the scrambling bits, the UE may perform linear modulation and, in some cases, transform precoding, as described in more detail herein. After linear modulation (and transform precoding, in some cases), the UE may perform an Inverse Fast Fourier Transform (IFFT) process. After the IFFT processing, the UE may multiplex the DMRS with the payload and CRC (e.g., symbols generated based at least in part on its bits). After multiplexing the DMRS with the payload and the CRC, the UE may perform radio resource mapping to generate an msgA preamble based at least in part on the PRACH preamble and to generate an msgA payload based at least in part on the payload and the CRC and the DMRS.

The UE may use the DMRS scrambling identifier to generate a DMRS for multiplexing with the content of the msgA. The UE may determine the DMRS scrambling identifier based at least in part on a waveform of a corresponding Physical Uplink Shared Channel (PUSCH) of the msgA. In a contention-based random access (CBRA) based two-step Random Access Channel (RACH) procedure, using DMRS scrambling identifiers based at least in part on PUSCH waveforms (e.g., discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms or cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms) may result in collisions between different DMRS. This may lead to communication interruption, throughput degradation, etc.

Accordingly, some aspects described herein enable a UE to use an extended DMRS scrambling identifier for a DMRS, the scrambling identifier determined based at least in part on a scrambling identifier for an msgA PUSCH to be multiplexed with the DMRS. For example, the UE may determine the extended DMRS scrambling identifier based at least in part on the PRACH preamble, as shown. In this manner, by reusing PRACH preambles to determine the extended DMRS scrambling identifier, the UE reduces the likelihood of collisions while increasing the processing and/or memory utilization associated with using other types of dedicated DMRS scrambling identifiers for various waveforms.

In some aspects, the UE may determine the extended DMRS scrambling identifier based at least in part on an amount of DMRS sequences supported by each antenna panel of the BS. In some aspects, the UE may map the PRACH preamble to a PUSCH resource element (PRU) to determine an extended DMRS scrambling identifier and perform a DMRS generation procedure. In this way, the UE may generate an extended DMRS scrambling identifier that reduces the likelihood of collision during CBRA-based two-step RACH.

As indicated above, fig. 5 is provided as an example. Other examples may differ from that described with respect to fig. 5.

Fig. 6 is a diagram illustrating an example 600 of using an extended DMRS scrambling identifier for DMRS communications in accordance with aspects of the present disclosure. As shown in fig. 6, example 600 includes BS110 in communication with UE 120.

As further shown in fig. 6 and by reference numeral 610, UE 120 may receive information identifying the amount of DMRS sequences supported by each antenna panel of BS110. For example, BS110 may transmit information identifying the amount of DMRS sequences supported by each antenna panel to a group of UEs 120 including the UE. In some aspects, UE 120 may receive DMRS sequence configuration information from BS110 based at least in part on one or more DMRS sequences used by BS110 for DMRS communications (e.g., by using an "msgA-ScramblingID0" parameter or an "msgA-ScramblingID1" parameter, or by configuring one or more additional DMRS locations, etc.). In this case, BS110 may configure one or more DMRS sequences based at least in part on the amount of DMRS sequences supported by each antenna panel. In some aspects, UE 120 may receive information indicating that BS110 supports 4 DMRS sequences per antenna panel, 8 DMRS sequences per antenna panel, and so on. In this case, the amount of DMRS sequences may correspond to the amount of DMRS scrambling identifiers (e.g., extended DMRS scrambling identifiers) supported by each antenna panel. In some aspects, BS110 may configure the extended DMRS scrambling identifier on a per antenna port basis and provide system information or RRC signaling to UE 120 to identify the configured extended DMRS scrambling identifier.

As further shown in fig. 6 and by reference numeral 620, UE120 may configure one or more DMRS sequences for DMRS communication. For example, UE120 may configure one or more DMRS sequences based at least in part on the amount of DMRS sequences supported by each antenna panel. Additionally or alternatively, the UE120 may configure one or more DMRS sequences based at least in part on the PRACH preamble. For example, UE120 may scramble one or more DMRS sequences using an extended DMRS scrambling identifier based at least in part on the PRACH preamble. In this way, UE120 may reuse the scrambling identifier of the msgA PUSCH to be transmitted with DMRS communication, as described above. In some aspects, UE120 may map the PRACH preamble to the PRU to reuse the scrambling identifier of the msgA PUSCH for extending the DMRS scrambling identifier.

In this case, UE120 may support one or more different possible mapping ratios. For example, UE120 may determine the mapping ratio based at least in part on an amount of PRACH sequences assigned for msgA preambles on a valid RACH Occasion (RO) and an amount of PRUs assigned for msgA payloads on a valid PUSCH Occasion (PO). In some aspects, UE120 may determine the mapping ratio based at least in part on a broadcast (e.g., system information) received from BS 110 or via RRC signaling from BS 110. Additionally or alternatively, after verifying the msgA resource occasion and the msgA RO and msgA PO for the two-step RACH, UE120 may determine a mapping ratio based at least in part on the verification rules and the mapping order (e.g., received from BS 110). In some aspects, each msgA PUSCH configuration in the initial or active bandwidth portion may be associated with a single mapping ratio, and different msgA PUSCH configurations may have different mapping ratios. The mapping ratio may be valid at least for a mapping period between msgA RO and msgA PUSCH PO. In this case, the mapping period may be a common multiple of the SSB to RO association mode period for each msgA PUSCH configuration.

In some aspects, UE 120 may use a particular DMRS pattern to generate DMRS communications. For example, UE 120 may generate DMRS based on a type I DMRS pattern, DMRS based on a type II DMRS pattern, and the like.

In some aspects, UE 120 may determine the extended DMRS scrambling identifier based at least in part on a waveform type for transmission that includes msgA PUSCH and DMRS communications. For example, for a CP-OFDM waveform, and when transform precoding is not enabled, UE 120 may determine the extended DMRS scrambling identifier based at least in part on an equation of the form:

in this case, UE 120 re-uses the bit scrambling sequence applied to the payload and CRC of msgA, as described above. Additionally or alternatively, UE 120 may determine the extended DMRS scrambling identifier based at least in part on an equation of the form:

where l is the OFDM symbol number within the slot, n _s,f ^μ Is the time slot number within the frame, and<·>is an internal quantity operator (e.g., truncates the internal quantity to K Most Significant Bits (MSBs) or Least Significant Bits (LSBs)). In this case, UE 120 determines the extended DMRS scrambling identifier based at least in part on the bit scrambling sequence, the symbol number of the DMRS, the slot number of the DMRS, and the like.

Additionally or alternatively, when the waveform is a DFT-s-OFDM waveform and transform precoding is enabled, UE 120 may determine the extended DMRS scrambling identifier for group hopping and sequence hopping such that:

v＝0

In this case, UE120 may be toThe method comprises the following steps:

additionally or alternatively, UE120 may be toThe method comprises the following steps:

in this case, supporting CP-OFDM or DFT-s-OFDM waveforms may correspond to UE120 determining whether to apply transform precoding to PUSCH transmissions, as described above (e.g., using CP-OFDM may correspond to not using transform precoding, and using DFT-s-OFDM may correspond to using transform precoding).

As further shown in fig. 6 and by reference numeral 630, UE120 may transmit DMRS communications. For example, based at least in part on configuring the DMRS sequence using the extended DMRS scrambling identifier, UE120 may transmit the DMRS multiplexed with the msgA PUSCH. In this way, BS 110 and UE120 reduce the likelihood of collisions between DMRSs in the CBRA-based two-step RACH.

As indicated above, fig. 6 is provided as an example. Other examples may differ from that described with respect to fig. 6.

Fig. 7 is a diagram illustrating an example process 700 performed, for example, by a UE, in accordance with aspects of the present disclosure. Example process 700 is an example of a UE (e.g., UE120, etc.) performing operations associated with using an extended demodulation reference signal scrambling identifier for demodulation reference signal communication.

As shown in fig. 7, in some aspects, process 700 may include receiving information from a BS identifying an amount of DMRS sequences supported by each antenna panel of the BS (block 710). For example, the UE (e.g., using antennas 252, DEMOD 254, MIMO detector 256, receive processor 258 or controller/processor 280, etc.) may receive information from the BS identifying the amount of DMRS sequences supported by each antenna panel of the BS, as described above.

As further shown in fig. 7, in some aspects, process 700 may include transmitting DMRS communications with one or more DMRS sequences configured based at least in part on an amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on a physical random access channel preamble (block 720). For example, the UE (e.g., using controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD254, or antenna 252, etc.) may transmit the DMRS communication with one or more DMRS sequences configured based at least in part on the amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier based at least in part on the physical random access channel preamble, as described above.

Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in combination with one or more other processes described elsewhere herein.

In a first aspect, process 700 includes configuring one or more DMRS sequences, including generating waveforms for DMRS communications, wherein the waveforms for DMRS communications are cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms or discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms.

In a second aspect, alone or in combination with the first aspect, the amount of DMRS sequences supported by each antenna panel is 4 or 8.

In a third aspect, alone or in combination with one or more of the first and second aspects, the DMRS pattern of the one or more DMRS sequences is a type I DMRS pattern or a type II DMRS pattern.

In a fourth aspect, alone or in combination with one or more of the first to third aspects, configuring one or more DMRS sequences comprises: the physical random access channel preamble is mapped to a physical uplink shared channel resource unit including one or more DMRS sequences in combination with a mapping ratio in a mapping period between the preamble and PUSCH resource units.

In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the DMRS communication is associated with a physical uplink shared channel with transform precoding.

In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the DMRS communication is associated with a physical uplink shared channel without transform precoding.

In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the extended DMRS scrambling identifier is based at least in part on a physical uplink shared channel scrambling identifier of a physical random access channel message associated with the physical random access channel preamble.

In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the extended DMRS scrambling identifier is configured on a per antenna port basis via system information or radio resource control transmissions.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the process 700 may include determining the mapping ratio based at least in part on at least one of a system information transmission received from the BS, a radio resource control transmission received from the BS, a set of validation rules, or a mapping order.

In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, mapping ratios are defined for PUSCH configurations such that each PUSCH configuration of the plurality of PUSCH configurations in the initial or active bandwidth part is associated with a single mapping ratio.

In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, a first PUSCH configuration of the plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration of the plurality of PUSCH configurations.

In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the mapping period is based at least in part on a synchronization signal block to resource occasion association pattern period.

In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the process 700 may include configuring one or more DMRS sequences for DMRS communication based at least in part on the amount of DMRS sequences supported by each antenna panel and the physical random access channel preamble; and transmitting the DMRS communication may include: the DMRS communication is transmitted based at least in part on one or more DMRS sequences configured for the DMRS communication.

While fig. 7 illustrates exemplary blocks of process 700, in some aspects process 700 may include additional blocks, fewer blocks, different blocks, or a different arrangement of blocks than depicted in fig. 7. Additionally or alternatively, two or more of the blocks of process 700 may be performed in parallel.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the aspects.

As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and/or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and/or a combination of hardware and software.

As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than or equal to a threshold, not equal to a threshold, etc., depending on the context.

It will be apparent that the systems and/or methods described herein may be implemented in various forms of hardware, firmware, and/or combinations of hardware and software. The actual specialized control hardware or software code used to implement the systems and/or methods is not limited in these respects. Thus, the operations and behavior of the systems and/or methods were described without reference to the specific software code-it being understood that software and hardware can be designed to implement the systems and/or methods based at least in part on the description herein.

Although specific combinations of features are recited in the claims and/or disclosed in the specification, such combinations are not intended to limit the disclosure of the various aspects. Indeed, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each of the dependent claims listed below may depend directly on only one claim, the disclosure of aspects includes the combination of each dependent claim with each other claim in the claim set. The phrase referring to at least one of the list of items "…" refers to any combination of those items that comprise a single member. As an example, "at least one of a, b, or c" is intended to encompass a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination of multiples of the same element (e.g., a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b-b, b-b-c, c-c, and c-c-c, or any other ordering of a, b, and c).

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. In addition, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more". Furthermore, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.), and are used interchangeably with "one or more. Where only one item is intended, the phrase "only one" or similar language is used. In addition, as used herein, the terms "having", and the like are intended to be open terms. Furthermore, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise.

Claims

1. A method of wireless communication performed by a user equipment, UE, comprising:

receiving, from a network entity, information identifying an amount of demodulation reference signal, DMRS, sequences supported by each antenna panel of the network entity; and

DMRS communications are transmitted with one or more DMRS sequences configured based at least in part on the amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier determined based at least in part on radio resources mapping a physical random access channel preamble to a physical uplink shared channel, PUSCH, resource element comprising the one or more DMRS sequences.

2. The method of claim 1, further comprising:

configuring the one or more DMRS sequences for the DMRS communication based at least in part on the amount of DMRS sequences supported by each antenna panel and the physical random access channel preamble; and is also provided with

Wherein transmitting the DMRS communication includes:

the DMRS communication is transmitted based at least in part on the one or more DMRS sequences configured for the DMRS communication.

3. The method of claim 2, wherein configuring the one or more DMRS sequences comprises:

a waveform for the DMRS communication is generated,

wherein the waveform for the DMRS communication is a cyclic prefix orthogonal frequency division multiplexing, CP-OFDM, waveform or a discrete fourier transform spread orthogonal frequency division multiplexing, DFT-s-OFDM, waveform.

4. The method of claim 1, wherein the amount of DMRS sequences supported by each antenna panel is 4 or 8.

5. The method of claim 1, wherein the DMRS pattern of the one or more DMRS sequences is a type I DMRS pattern or a type II DMRS pattern.

6. The method of claim 1, wherein the extended DMRS scrambling identifier is configured on a per antenna port basis via system information or radio resource control transmissions.

7. The method of claim 1, wherein the radio resource mapping comprises:

the physical random access channel preamble is mapped to the physical uplink shared channel PUSCH resource elements including the one or more DMRS sequences in combination with a mapping ratio within a mapping period between preamble and PUSCH resource elements.

8. The method of claim 7, further comprising:

the mapping ratio is determined based at least in part on at least one of:

a system information transmission received from the network entity,

a radio resource control transmission received from the network entity,

a set of validation rules, or

Mapping order.

9. The method of claim 7, wherein the mapping ratio is defined for PUSCH configurations such that each PUSCH configuration of a plurality of PUSCH configurations in an initial or active bandwidth portion is associated with a single mapping ratio.

10. The method of claim 9, wherein a first PUSCH configuration of the plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration of the plurality of PUSCH configurations.

11. The method of claim 7, wherein the mapping period is based at least in part on a synchronization signal block to random access channel occasion association pattern period.

12. The method of claim 1, wherein the DMRS communication is associated with a physical uplink shared channel with transform precoding.

13. The method of claim 1, wherein the DMRS communication is associated with a physical uplink shared channel without transform precoding.

14. The method of claim 1, wherein the extended DMRS scrambling identifier is based at least in part on a physical uplink shared channel, PUSCH, scrambling identifier of a physical random access channel message associated with a physical random access channel preamble.

15. A user equipment, UE, for wireless communication, comprising:

a memory; and

one or more processors coupled with the memory, the memory and the one or more processors configured to:

a DMRS communication is transmitted having one or more DMRS sequences configured based at least in part on the amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier determined based at least in part on radio resources mapping a physical random access channel preamble to a physical uplink shared channel, PUSCH, resource element comprising the one or more DMRS sequences.

16. The UE of claim 15, wherein the one or more processors are further configured to:

Wherein, when transmitting the DMRS communication, the one or more processors are configured to:

17. The UE of claim 16, wherein when configuring the one or more DMRS sequences, the one or more processors are configured to:

a waveform for the DMRS communication is generated,

18. The UE of claim 15, wherein the amount of DMRS sequences supported by each antenna panel is 4 or 8.

19. The UE of claim 15, wherein the DMRS pattern of the one or more DMRS sequences is a type I DMRS pattern or a type II DMRS pattern.

20. The UE of claim 15, wherein the extended DMRS scrambling identifier is configured on a per antenna port basis via system information or radio resource control transmissions.

21. The UE of claim 15, wherein the one or more processors are further configured to:

the extended DMRS scrambling identifier is determined by mapping the physical random access channel preamble to a physical uplink shared channel, PUSCH, resource element comprising the one or more DMRS sequences in combination with a mapping ratio within a mapping period between preamble and PUSCH resource elements.

22. The UE of claim 21, wherein the one or more processors are further configured to:

the mapping ratio is determined based at least in part on at least one of:

a system information transmission received from the network entity,

a radio resource control transmission received from the network entity,

a set of validation rules, or

Mapping order.

23. The UE of claim 21, wherein the mapping ratio is defined for PUSCH configurations such that each PUSCH configuration of a plurality of PUSCH configurations in an initial or active bandwidth portion is associated with a single mapping ratio.

24. The UE of claim 23, wherein a first PUSCH configuration of the plurality of PUSCH configurations is associated with a different mapping ratio than a second PUSCH configuration of the plurality of PUSCH configurations.

25. The UE of claim 21, wherein the mapping period is based at least in part on a synchronization signal block to random access channel occasion association pattern period.

26. The UE of claim 15, wherein the DMRS communication is associated with a physical uplink shared channel with transform precoding.

27. The UE of claim 15, wherein the DMRS communication is associated with a physical uplink shared channel without transform precoding.

28. The UE of claim 15, wherein the extended DMRS scrambling identifier is based at least in part on a physical uplink shared channel PUSCH scrambling identifier of a physical random access channel message associated with a physical random access channel preamble.

29. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a user equipment, UE, cause the one or more processors to:

30. An apparatus for wireless communication, comprising:

means for receiving, from a network entity, information identifying an amount of demodulation reference signal, DMRS, sequences supported by each antenna panel of the network entity; and

means for transmitting DMRS communications having one or more DMRS sequences configured based at least in part on the amount of DMRS sequences supported by each antenna panel and scrambled using an extended DMRS scrambling identifier determined based at least in part on radio resources mapping a physical random access channel preamble to a physical uplink shared channel, PUSCH, resource element comprising the one or more DMRS sequences.